Analysis of spectra of V471 Tau and HD 115404 |
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Authors: | V V Shimansky I F Bikmaev N N Shimanskaya |
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Institution: | 1.Kazan (Volga region) Federal University,Kazan,Russia;2.Special Astrophysical Observatory,Russian Academy of Sciences,Nizhnii Arkhyz,Russia;3.Academy of Sciences of the Republic of Tatarstan,Kazan,Russia |
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Abstract: | We analyze the chemical composition of the atmospheres of a single K-type star HD 115404 and the secondary component of the
V471 Tau variable. We use the technique of modeling of synthetic spectra to analyze the high-resolution spectra of these stars,
taken with the RTT 150 Russian-Turkish telescope and find the abundances of 23 and 17 elements in the atmospheres of HD 115404
and V471 Tau, respectively. We demonstrate the lack of composition anomalies in the HD 115404 and show it to be consistent
with the published data, inferred from equivalent widths of spectral lines. We find the abundances of 15 elements from Na
to Ba to be consistent with the metallicity of the atmosphere of V471 Tau (Fe/H] = −0.22 ± 0.12dex), which differs significantly
from the average metallicity of the Hyades cluster. We show the existence of strong carbon and oxygen overabundances (by more
than 1dex) due to the enrichment of the secondary by the nucleosynthesis products during the common-envelope stage of the
system. On the whole, we demonstrate that V471 Tau and the other precataclysmic variables share similar composition anomalies. |
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